I tried to use the above app to convert my comics, unfortunately I'm getting the following error:
Of course I tried to install PIL afterwards (roaming google for hours and typing stuff that I don't understand into Terminal), but I haven't been successful. Is there an easier way to do this?

Of course I also tried dropping the unpacked cbz onto the app... same error.

Oh and your github link mentions "unrar" and "rarfile". I downloaded both but Im not sure about where to put them.

Anyway, thanks for your efforts. If I get this thingy to work it will be the fulfillment of my wildest eBook-reader-dreams!

I know, installing PIL is not funny at all, and this is the main point for I want to make a redistributable app via py2app.
In the meantime, you can look here for some hints; basicly you have to:
Install libjpeg

and then install PIL.
As you get it installed, you should not have anymore that error.
Unrar and rarfile.py are included in the droplet, so you should not worry about missing them (I put them in requirements section for the bare python script users).
Let me know if it works!

I know, installing PIL is not funny at all, and this is the main point for I want to make a redistributable app via py2app.
In the meantime, you can look here for some hints; basicly you have to:
Install libjpeg

and then install PIL.
As you get it installed, you should not have anymore that error.
Unrar and rarfile.py are included in the droplet, so you should not worry about missing them (I put them in requirements section for the bare python script users).
Let me know if it works!

Thanks for your quick response.
I actually found that exact same page and tried to enter the code (not knowing what it does, of course).
It starts working fine, but I get the first error when I get to the "./configure" command. It says "configure: error: no acceptable C compiler found in $PATH".
And then if I go with "make" on he simply outputs "-bash: make: command not found".

I simply entered line after line? Am I doing something wrong?

So I guess I need to get a C compiler (an acceptable one ) and put it somewhere?

There was a time when ACDSee (a free program in the Windows 95 era) could batch convert, and batch crop pictures.
Their JPeg image compression was really good as well! High quality for a very low size.

Can anyone tell me if the Paperwhite reads jpeg2000?
And what is the best format it can read for photo's, graphics, or maps?
(Usually maps is .gif, photo's jpeg 2000, and old school graphics either SVT or GIF or compressed TIFF.

Alright, so I downloaded Xcode, installed it and somehow managed to get the compiler into /usr/bin. Then I tried again installing libjpeg, freetype and PIL following the instructions from the link. And apparently it worked.

Unfortunately now I am getting this error:

However, it dropped a .mobi file into the folder and after manually putting it on my kindle... voila! Although panel-view doesn't seem to work (he ignores the middle row of panels and skips right to the third) it's legible just fine in fullscreen.

If asked for I could make a before-after pic. It's great, but maybe the error message provides some intel anyway

@floher i can't see errors in kindlegen output, maybe I left the dialog on for debugging, i check later on github. Unfortunately I don't own a Paperwhite anymore, I ask for a change 3 times with no luck (rainbow panel ) so I sent Amazon back and keep my K3 for the moment I've yet to try if panel view is supported on it, though...

@floher i can't see errors in kindlegen output, maybe I left the dialog on for debugging, i check later on github. Unfortunately I don't own a Paperwhite anymore, I ask for a change 3 times with no luck (rainbow panel ) so I sent Amazon back and keep my K3 for the moment I've yet to try if panel view is supported on it, though...

Aww, shit man. I've had the same issue. Fortunately I just got the 3rd replacement and it's perfect. Though I also would've sticked with one the others (which was allright). Good luck if you ever decide to give it another try.

And even if you discontinue support on this little app, thanks a lot! I mean there's some error messages which makes it hard to convert several comics at once, but else it's a great help!

P.S. I have Kindle Touch, and I'm not sure, this mobi-file will work on it without margins. Please, can anybody upload some manga mobi-file in KF8 (800*600px)?

it seems your errors are caused by your PIL installation (I know it's a pain in the arse, I'm looking to get rid of it in favour of Pillow or ImageMagick and make cooked packages via py2app), I'd suggest you to get rid of all PIL versions and reinstall following the procedure a few post above; and ensure you're using Python 2.7 as PIL - and therefore kcc - is not Python3 compliant.
Today I pushed a bunch of fixes on github, so you may want to pull fresh sources; I'm also working hardly for a bare-metal GUI with Tkinter to get rid of the droplet and eventually package the app.
Stay tuned!

PS: yes, the mobi will display margin-free on K4 at that resolution, I checked today against K3 (keyboard) too.